Model Paper 1 — Physics STD 12 Science — Question

What is the momentum of a photon having frequency 1.5 

(a) 3.3	(b) 3.3
(c) 6.6	(d) 6.6

The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of 5Ω the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell

(a) 1.2 Ω

(b) 1.3 Ω

(c) 1.1 Ω

(d) 1.4 Ω

What is the driving force in a working Electrical Circuit?

A 220 V A.C. supply is connected between points A and B (Fig.). What will be the potential difference V across the capacitor?

When radiation of wavelength   is incident on a metallic surface, the stopping potential is 4.8 volts. If the same surface is illuminated with radiation of double the wavelength, then the stopping potential becomes 1.6 volts. Then the threshold wavelength for the surface is

(a) 2

(b) 4

(c) 6

(d) 8

The charge of an electron is 1.6 × 10^–19 C.  How many electrons strike the screen of a cathode ray tube each second when the beam current is 16 mA

(a) 1017

(b) 1019

(c) 10–19

(d) 10–17

Eight small drops, each of radius r and having same charge q are combined to form a big drop. The ratio between the potentials of the bigger drop and the smaller drop is

(a) 8 : 1

(b) 4 : 1

(c) 2 : 1

(d) 1 : 8

The wavelength of light visible to eye is of the order of:

A charged particle goes undeflected in a region containing an electric and a magnetic field. It is possible that

The energy of electron in first excited state of H-atom is  -3.4 eV  its kinetic energy is

(a) – 3.4 eV

(b) + 3.4 eV

(c) – 6.8 eV

(d) 6.8 eV